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commit 6cacf06e8edd9db06c644b7c23267748d7f8b5d7 Author: wenbingshen <[email protected]> AuthorDate: Wed May 31 12:10:13 2023 +0800 clear channel when channelInactive (#3966) ### Motivation I am stopping a pulsar broker, and I observed a lot of the following logs in the broker log: ``` 17:48:35.894 [shutdown-thread-43-1] INFO org.apache.bookkeeper.proto.PerChannelBookieClient - Closing the per channel bookie client for 10.184.xx.xx:3181 17:48:35.894 [shutdown-thread-43-1] ERROR io.netty.util.concurrent.DefaultPromise.rejectedExecution - Failed to submit a listener notification task. Event loop shut down? java.util.concurrent.RejectedExecutionException: event executor terminated at io.netty.util.concurrent.SingleThreadEventExecutor.reject(SingleThreadEventExecutor.java:923) ~[io.netty-netty-common-4.1.66.Final.jar:4.1.66.Final] at io.netty.util.concurrent.SingleThreadEventExecutor.offerTask(SingleThreadEventExecutor.java:350) ~[io.netty-netty-common-4.1.66.Final.jar:4.1.66.Final] at io.netty.util.concurrent.SingleThreadEventExecutor.addTask(SingleThreadEventExecutor.java:343) ~[io.netty-netty-common-4.1.66.Final.jar:4.1.66.Final] at io.netty.util.concurrent.SingleThreadEventExecutor.execute(SingleThreadEventExecutor.java:825) ~[io.netty-netty-common-4.1.66.Final.jar:4.1.66.Final] at io.netty.util.concurrent.SingleThreadEventExecutor.execute(SingleThreadEventExecutor.java:815) ~[io.netty-netty-common-4.1.66.Final.jar:4.1.66.Final] at io.netty.util.concurrent.DefaultPromise.safeExecute(DefaultPromise.java:842) ~[io.netty-netty-common-4.1.66.Final.jar:4.1.66.Final] at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:499) ~[io.netty-netty-common-4.1.66.Final.jar:4.1.66.Final] at io.netty.util.concurrent.DefaultPromise.addListener(DefaultPromise.java:184) ~[io.netty-netty-common-4.1.66.Final.jar:4.1.66.Final] at io.netty.channel.DefaultChannelPromise.addListener(DefaultChannelPromise.java:95) ~[io.netty-netty-transport-4.1.66.Final.jar:4.1.66.Final] at io.netty.channel.DefaultChannelPromise.addListener(DefaultChannelPromise.java:30) ~[io.netty-netty-transport-4.1.66.Final.jar:4.1.66.Final] at org.apache.bookkeeper.proto.PerChannelBookieClient.closeChannel(PerChannelBookieClient.java:1090) ~[org.apache.bookkeeper-bookkeeper-server-4.14.2.jar:4.14.2] at org.apache.bookkeeper.proto.PerChannelBookieClient.closeInternal(PerChannelBookieClient.java:1079) ~[org.apache.bookkeeper-bookkeeper-server-4.14.2.jar:4.14.2] at org.apache.bookkeeper.proto.PerChannelBookieClient.close(PerChannelBookieClient.java:1063) ~[org.apache.bookkeeper-bookkeeper-server-4.14.2.jar:4.14.2] at org.apache.bookkeeper.proto.DefaultPerChannelBookieClientPool.close(DefaultPerChannelBookieClientPool.java:157) ~[org.apache.bookkeeper-bookkeeper-server-4.14.2.jar:4.14.2] at org.apache.bookkeeper.proto.BookieClientImpl.close(BookieClientImpl.java:587) ~[org.apache.bookkeeper-bookkeeper-server-4.14.2.jar:4.14.2] at org.apache.bookkeeper.client.BookKeeper.close(BookKeeper.java:1435) ~[org.apache.bookkeeper-bookkeeper-server-4.14.2.jar:4.14.2] at org.apache.pulsar.broker.ManagedLedgerClientFactory.close(ManagedLedgerClientFactory.java:142) ~[org.apache.pulsar-pulsar-broker-2.8.1.jar:2.8.1] at org.apache.pulsar.broker.PulsarService.closeAsync(PulsarService.java:417) ~[org.apache.pulsar-pulsar-broker-2.8.1.jar:2.8.1] at org.apache.pulsar.broker.MessagingServiceShutdownHook.lambda$run$1(MessagingServiceShutdownHook.java:62) ~[org.apache.pulsar-pulsar-broker-2.8.1.jar:2.8.1] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [?:1.8.0_131] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [?:1.8.0_131] at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) [io.netty-netty-common-4.1.66.Final.jar:4.1.66.Final] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_131] ``` When I stopped the broker, there were more than 30,000 lines in such a log, which seriously polluted my normal log of the broker. <img width="1180" alt="image" src="https://github.com/apache/bookkeeper/assets/35599757/0ec3c423-14f1-41c4-85c3-d978ece15044";> According to my next investigation, 1. When the broker stops, it will close the ManagedLedgerClientFactory. It will close all bookkeeper connections https://github.com/apache/bookkeeper/blob/master/bookkeeper-server/src/main/java/org/apache/bookkeeper/proto/DefaultPerChannelBookieClientPool.java#L154 ```java @Override public void close(boolean wait) { for (int i = 0; i < clients.length; i++) { clients[i].close(wait); if (clients != clientsV3Enforced) { clientsV3Enforced[i].close(wait); } } } private void closeInternal(boolean permanent, boolean wait) { Channel toClose = null; synchronized (this) { if (permanent) { state = ConnectionState.CLOSED; } else if (state != ConnectionState.CLOSED) { state = ConnectionState.DISCONNECTED; } toClose = channel; channel = null; makeWritable(); } if (toClose != null) { <== a. toClose not null ChannelFuture cf = closeChannel(toClose); if (wait) { cf.awaitUninterruptibly(); } } } private ChannelFuture closeChannel(Channel c) { if (LOG.isDebugEnabled()) { LOG.debug("Closing channel {}", c); } return c.close().addListener(x -> makeWritable()); <== b. here if channel is already inactive, add the listener will throw exception } ``` 2. When the bookie server first disconnects the client, the client will trigger channelInactive ```java public void channelInactive(ChannelHandlerContext ctx) throws Exception { LOG.info("Disconnected from bookie channel {}", ctx.channel()); if (ctx.channel() != null) { closeChannel(ctx.channel()); <== c. here channel is closed if (ctx.channel().pipeline().get(SslHandler.class) != null) { activeTlsChannelCounter.dec(); } else { activeNonTlsChannelCounter.dec(); } } errorOutOutstandingEntries(BKException.Code.BookieHandleNotAvailableException); errorOutPendingOps(BKException.Code.BookieHandleNotAvailableException); synchronized (this) { if (this.channel == ctx.channel() && state != ConnectionState.CLOSED) { state = ConnectionState.DISCONNECTED; } } // we don't want to reconnect right away. If someone sends a request to // this address, we will reconnect. } ``` If step c happens before b, then b throws the above exception. step c <img width="1400" alt="image" src="https://github.com/apache/bookkeeper/assets/35599757/4a33855c-5682-4812-ae0e-1a02972ef502";> <img width="1407" alt="image" src="https://github.com/apache/bookkeeper/assets/35599757/1c99bccb-b2bd-4cfb-ac4b-ee10b2d236b0";> step a and b <img width="1403" alt="image" src="https://github.com/apache/bookkeeper/assets/35599757/fec372c5-f97b-47e7-b5d7-ebbaa6edf682";> So when channelInactive, we should reset the channel to null after closed the channel. Here, when the channel is null, we will reconnect after getting the client, which is consistent with the current behavior.  (cherry picked from commit 808b909edf597254aea212c287fe17fb6d808198) --- .../main/java/org/apache/bookkeeper/proto/PerChannelBookieClient.java | 1 + 1 file changed, 1 insertion(+) diff --git a/bookkeeper-server/src/main/java/org/apache/bookkeeper/proto/PerChannelBookieClient.java b/bookkeeper-server/src/main/java/org/apache/bookkeeper/proto/PerChannelBookieClient.java index 01f8a8154f..c8fbd37507 100644 --- a/bookkeeper-server/src/main/java/org/apache/bookkeeper/proto/PerChannelBookieClient.java +++ b/bookkeeper-server/src/main/java/org/apache/bookkeeper/proto/PerChannelBookieClient.java @@ -1248,6 +1248,7 @@ public class PerChannelBookieClient extends ChannelInboundHandlerAdapter { if (this.channel == ctx.channel() && state != ConnectionState.CLOSED) { state = ConnectionState.DISCONNECTED; + channel = null; } }
